Preparation and Performance of Al2TiO5-TiO2-SiO2 Honeycomb Ceramics by Doping Rare Earth
来源期刊：JOURNAL OF RARE EARTHS2007年第4期
论文作者：Wang Jialei Liu Yayun Zhang Yandong Shen Yuesong Zhu Shemin
Key words：honeycomb ceramics; deNOx; cerium oxide; erbium oxide; bending strength; thermal expansion coefficient;
Abstract: A preferable honeycomb ceramics of Al2TiO5-TiO2-SiO2 doped by CeO2 and Er2O3 with high performance was prepared by means of extrusion molding and the effects of CeO2 and Er2O3 on the mechanical strength, thermal stability, and sintering temperature of ATS ceramics were mainly investigated. The exp erimental results and the microscopic analysis by scanning electron microscope, X-ray powder diffraction, and TG-DSC showed that adding CeO2 and Er2O3 into ATS could prohibit the growth of their crystal grains and make their size uniform, which finally decrease its sintering temperature, and also enhance its mechanical performance as well as thermal stability. After the reforming, ATS doped by 0.5%CeO2+0.5%Er2O3 was sintered at 1250 ℃, its bending strength reached to 177.4 MPa and thermal expansion coefficient was 3.8×10-6/℃ at 25～1000 ℃, which provided a promising basis of making monolithic honeycomb catalyst of deNOx.
Wang Jialei1，Liu Yayun1，Zhang Yandong1，Shen Yuesong1，Zhu Shemin1
(1.College of Material Science and Engineering, Nanjing University of Technology, Nanjing 210009, China)
Abstract:A preferable honeycomb ceramics of Al2TiO5-TiO2-SiO2 doped by CeO2 and Er2O3 with high performance was prepared by means of extrusion molding and the effects of CeO2 and Er2O3 on the mechanical strength, thermal stability, and sintering temperature of ATS ceramics were mainly investigated. The exp erimental results and the microscopic analysis by scanning electron microscope, X-ray powder diffraction, and TG-DSC showed that adding CeO2 and Er2O3 into ATS could prohibit the growth of their crystal grains and make their size uniform, which finally decrease its sintering temperature, and also enhance its mechanical performance as well as thermal stability. After the reforming, ATS doped by 0.5%CeO2+0.5%Er2O3 was sintered at 1250 ℃, its bending strength reached to 177.4 MPa and thermal expansion coefficient was 3.8×10-6/℃ at 25～1000 ℃, which provided a promising basis of making monolithic honeycomb catalyst of deNOx.
Key words:honeycomb ceramics; deNOx; cerium oxide; erbium oxide; bending strength; thermal expansion coefficient;
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